| Author | Message | ||
| Jeff Howe (Ferrari_uk)
Member Username: Ferrari_uk Post Number: 451 Registered: 12-2002 |
Hi Joe et al... We have pumps in stock, #121727 for $152. Any use ? Cheers. | ||
| Joe Craven (Rscapri2600)
New member Username: Rscapri2600 Post Number: 16 Registered: 7-2002 |
I think I finally found the problem. I have no fuel pressure now (pump is making noise) so it is either faulty or the screen in the tank is plugged. Unfortunately, the tank is 90% full and I was planning to use the fuel pump to drain the tank. I'm going to order a new pump anyways and replace it while I'm down there draining the tank and cleaning the filter. Here is what I did tonight. 1) ran pump and fuel pressure topped out at 3.5 bar. Spec is 5.0 to 5.5 bar 2) I was going to drain the tank, but decided to connect my fuel pressure gauge directly to the pump output. (Big mistake). My wife is watching the gauge while I jumper the fuse box. She quickly tells me that the gauge is pegged seconds after I start the pump. Ooops, this is well over 100psi. I stop the fuel pump and the gauge now reads .5 bar w/o any fuel pressure. Darn, I damaged my new gauge. 3) I reconnect the gauge as specified in the workshop manual to test the gauge and see how bad the damage is. I start the fuel pump and the gauge is now reading 5.5 bar. Hmmm, hey, this is within spec. I start the engine and it purrs along like it should. Pressure is staying at 5.5 bar. Engine runs for about 1 minute and suddenly dies. The pressure gauge is now reading 0 bar. I confirm that pump is running although it sounds very different now. It sounds like a simple motor that is just spinning. Either there is an impeller that has detached from the fuel pump motor or the fuel pickup screen in the fuel tank is completely clogged. 85 Mondial QV 1 step closer to getting back on the road. | ||
| Mark Foley (Sparky)
Junior Member Username: Sparky Post Number: 67 Registered: 3-2002 |
Joe: There is a fuel strainer in the fuel tank--if this is restricted the car won't run. See picture.  Try removing (with a 15/16 deep socket) and cleaning. Mark | ||
| Manfred Heger (Mondi991)
Junior Member Username: Mondi991 Post Number: 63 Registered: 4-2003 |
Hi Joe, I�d got similar problems with my 1984 Mondial QV, I although first thought it was a fuelcaused Problem, so I changed Fuelfilter and Fuelreservoir, but no reaction. The solution of my Problem was a complete new Set of Ignitionwires and Plugs and all was ok. My Problem was car running fine till 4000 rpm, over 4000 rpm it quits with a lot of misfire and no more power. Hope to give you a little help Manfred from Germany | ||
| Joe Craven (Rscapri2600)
New member Username: Rscapri2600 Post Number: 15 Registered: 7-2002 |
Thanks Verell, I removed the plate and found the marks. An odd thing happened while I was testing the timing. Everything looked good on the rear bank, I saw the timing mark lining up near the pointer, then the motor began faltering and finally stalled. I finally determined that I was only getting 3 bar fuel pressure. I was getting 5.1 bar yesterday...... I either have a bad fuel pump or a faulty pressure regulator in my fuel distributor. Anybody ever work on these before? The fuel filter is almost new. I was having these problems before I replace the fuel filter so I don't think that is it unfortunately. 85 Mondial QV | ||
| Verell Boaen (Verell)
Intermediate Member Username: Verell Post Number: 1003 Registered: 5-2001 |
re: ? Is there some external marks that I can use to check each banks spark fire timing against, like one used to do in the old days with points ignitions? I'd like to verify that I have x deg of advance at idle and XX degs of advance at 3500rpm for example on each of the banks. Remove the access plate on top of the bell housing. There's a triangular pointer pointing down. The flywheel has 2 sets of marks, 1 for each bank. PM1-4 is TDC for cyl #1, PM5-8 for cyl #5. There are also marks for timing advance. The 308GT4 FSM has a good drawing of the flywheel & it's marks. BTW, any chance you've got a clogged or collapsed fuel filter that's not flowing properly? | ||
| Joe Craven (Rscapri2600)
New member Username: Rscapri2600 Post Number: 12 Registered: 7-2002 |
I've been trying to determine why my 85 QV is running poorly. It idles fine, but just doesn't want to rev and probably only puts out 50 HP at the moment. When I rev it, it misses and pops a bit. The car recently had it's 30K service and it ran the same as before the service. New plugs, belts, tensioners, valve adjust etc. I also successfully passed Ca smog inspection so it actually burns relatively clean. The car used to run strong until it was shut down and restarted. Thereafter, it would not rev over 4000rpm. Recently, it is now running poorly all the time. OK, I've tested the following. plug wires - tested from 700 ohms to 1100 ohms on the longest leads. I found one measuring open and replaced it. caps/rotors - they look good, I cleaned them good and clean/shiny while I was in there. fuel pump - I just finished testing the fuel pump today. 5.1 bar system pressure and warmup reg. looks good. I only got about 850ml of gas on the flow test in 30 seconds (manual specifies 1000ml). I measured only 10.6V across the pump (manual specifies 11.5V). I checked the fuse box and I'm getting 11.6V at the fuel pump fuse with the pump running. (I'll have to wire up a separate circuit to bypass the fuse box resistance). I actually removed the fuse box and it looks to be in good condition with nothing obviously wrong, nor any signs of overheating. ???? ignition - coils ohm out good and I'm getting spark to both the front and rear banks and I tested one plug wire on each bank. I hooked up my timing light to various wires and the light does keep up with the engine rpm. My next step is verify spark at each plug. I'm suspecting that I have a Marelli Magnetti ignition box problem. Does anybody have any ideas on how to test it? Is there some external marks that I can use to check each banks spark fire timing against, like one used to do in the old days with points ignitions? I'd like to verify that I have x deg of advance at idle and XX degs of advance at 3500rpm for example on each of the banks. Thanks for your suggestions. Joe Craven 85 QV Mondial Cab (I miss driving it!) |